Siemens SINUMERIK 802D sl Programming And Operating Manual page 184

Cycles
9.12 Surface grinding with intermittent infeed - CYCLE428
This infeed is circular so that sudden acceleration can be avoided.
With this method, it is also possible to select the infeed side in the Z direction.
Y infeed takes place at the X and Z reversal points (left/rear, right/rear, left/front or
right/front).
Intermediate dressing, interruption and use of the handwheel are all supported.
The keys will only ever respond at the end point.
At the end, the tool retracts or grinding continues with a different technology.
A higher infeed amount can be used at the start of machining. Once contact has been
detected using an acoustic emission sensor, the tool will retract by the acoustic emission
sensor infeed amount minus the grinding infeed amount. If no acoustic emission sensor input
has been configured, the cycle will immediately switch to the handwheel at the start of the
operation.
The value of the FZ parameter (infeed per stroke) can be used to determine whether the X
values should be used for the start or the end of the circular motion. If the values used are
negative, then the X positions will not be overtraveled, even with circular interpolation.
Sequence
Traverse to allowance position. Approach X starting position and Z starting position.
Start oscillating motion, infeed at reversal points.
The first infeed once oscillating motion has commenced is adjusted to ensure that all
additional infeed operations correspond to the infeed amount. This process is also performed
following interruptions, intermediate dressing and deselection of the handwheel override
function.
The oscillating motion is not performed with the oscillation function, as this would cause
problems in terms of residual path deletion, and would overload the PLC.
Following interruption/dressing, an off-loading value is applied as the tool approaches the
machining start point.
At the end, the tool retracts by the retraction amount or machining continues at the end point
using a new technology. In other words, if the oscillating axis is at the X axis end or start
point and the allowance is correct, machining will continue from this point. As a result, it is
possible to combine any number of technology seats.
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Programming and Operating Manual, 11/2012, 6FC5398-5CP10-3BA0
Surface grinding